feat: add authentication support and user model

- Updated `env.example` to include NextAuth configuration for authentication.
- Added `next-auth` dependency to manage user sessions.
- Introduced `User` model in Prisma schema with fields for user details and password hashing.
- Integrated `AuthProvider` in layout for session management across the app.
- Enhanced `Header` component with `AuthButton` for user authentication controls.

src/actions/profile.ts

@@ -0,0 +1,103 @@
+'use server'
+
+import { getServerSession } from 'next-auth/next'
+import { authOptions } from '@/lib/auth'
+import { usersService } from '@/services/users'
+import { revalidatePath } from 'next/cache'
+
+export async function updateProfile(formData: {
+  name?: string
+  firstName?: string
+  lastName?: string
+  avatar?: string
+}) {
+  try {
+    const session = await getServerSession(authOptions)
+    
+    if (!session?.user?.id) {
+      return { success: false, error: 'Non authentifié' }
+    }
+
+    // Validation
+    if (formData.firstName && formData.firstName.length > 50) {
+      return { success: false, error: 'Le prénom ne peut pas dépasser 50 caractères' }
+    }
+
+    if (formData.lastName && formData.lastName.length > 50) {
+      return { success: false, error: 'Le nom ne peut pas dépasser 50 caractères' }
+    }
+
+    if (formData.name && formData.name.length > 100) {
+      return { success: false, error: 'Le nom d\'affichage ne peut pas dépasser 100 caractères' }
+    }
+
+    if (formData.avatar && formData.avatar.length > 500) {
+      return { success: false, error: 'L\'URL de l\'avatar ne peut pas dépasser 500 caractères' }
+    }
+
+    // Mettre à jour l'utilisateur
+    const updatedUser = await usersService.updateUser(session.user.id, {
+      name: formData.name || null,
+      firstName: formData.firstName || null,
+      lastName: formData.lastName || null,
+      avatar: formData.avatar || null,
+    })
+
+    // Revalider la page de profil
+    revalidatePath('/profile')
+
+    return {
+      success: true,
+      user: {
+        id: updatedUser.id,
+        email: updatedUser.email,
+        name: updatedUser.name,
+        firstName: updatedUser.firstName,
+        lastName: updatedUser.lastName,
+        avatar: updatedUser.avatar,
+        role: updatedUser.role,
+        createdAt: updatedUser.createdAt.toISOString(),
+        lastLoginAt: updatedUser.lastLoginAt?.toISOString() || null,
+      }
+    }
+
+  } catch (error) {
+    console.error('Profile update error:', error)
+    return { success: false, error: 'Erreur lors de la mise à jour du profil' }
+  }
+}
+
+export async function getProfile() {
+  try {
+    const session = await getServerSession(authOptions)
+    
+    if (!session?.user?.id) {
+      return { success: false, error: 'Non authentifié' }
+    }
+
+    const user = await usersService.getUserById(session.user.id)
+    
+    if (!user) {
+      return { success: false, error: 'Utilisateur non trouvé' }
+    }
+
+    return {
+      success: true,
+      user: {
+        id: user.id,
+        email: user.email,
+        name: user.name,
+        firstName: user.firstName,
+        lastName: user.lastName,
+        avatar: user.avatar,
+        role: user.role,
+        createdAt: user.createdAt.toISOString(),
+        lastLoginAt: user.lastLoginAt?.toISOString() || null,
+      }
+    }
+
+  } catch (error) {
+    console.error('Profile get error:', error)
+    return { success: false, error: 'Erreur lors de la récupération du profil' }
+  }
+}